76% (2000)

78% (2010)

76% (2009)

73% (2002)

74% (2004)

72% (1998)

76% (1993)

64% (1993)

70% (2001)

75% (1994)

73% (1996)

68% (2000)

82% (1999)

67% (2000)

71% (1998)

72% (2003)

32% (2010)

71% (2010)

61% (1996)

48% (2012)